Hi Grant, For a few years now I have used the MooshiMeter https://moosh.im/mooshimeter/ <https://moosh.im/mooshimeter/> It is inexpensive, nicely made in the USA and has been dead reliable. Cheers & 73, Howie / WA4PSC CE - WXYC-FM 89.3 UNC Chapel Hill, NC www.wxyc.org